/*
 * QEMU System Emulator
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "net/slirp.h"

#include "config-host.h"

#include "net.h"
#include "monitor.h"
#include "sysemu.h"
#include "qemu_socket.h"
#include "slirp/libslirp.h"

#include "net/utils/utils.h"
#include "net/utils/color.h"

static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
{
	const char *p, *p1;
	int len;
	p = *pp;
	p1 = strchr(p, sep);
	if (!p1)
		return -1;
	len = p1 - p;
	p1++;
	if (buf_size > 0)
	{
		if (len > buf_size - 1)
			len = buf_size - 1;
		memcpy(buf, p, len);
		buf[len] = '\0';
	}
	*pp = p1;
	return 0;
}

/* slirp network adapter */

#define SLIRP_CFG_HOSTFWD 1
#define SLIRP_CFG_LEGACY  2

struct slirp_config_str
{
	struct slirp_config_str *next;
	int flags;
	char str[1024];
	int legacy_format;
};

typedef struct SlirpState
{
	VLANClientState nc;
	QTAILQ_ENTRY(SlirpState) entry;
	Slirp *slirp;
#ifndef _WIN32
	char smb_dir[128];
#endif
} SlirpState;

static struct slirp_config_str *slirp_configs;
const char *legacy_tftp_prefix;
const char *legacy_bootp_filename;
static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks =
QTAILQ_HEAD_INITIALIZER(slirp_stacks);

static int slirp_hostfwd(SlirpState *s, const char *redir_str,
		int legacy_format);
static int slirp_guestfwd(SlirpState *s, const char *config_str,
		int legacy_format);

#ifndef _WIN32
static const char *legacy_smb_export;

static int slirp_smb(SlirpState *s, const char *exported_dir,
		struct in_addr vserver_addr);
static void slirp_smb_cleanup(SlirpState *s);
#else
static inline void slirp_smb_cleanup(SlirpState *s)
{}
#endif

int slirp_can_output(void *opaque)
{
	SlirpState *s = opaque;

	return qemu_can_send_packet(&s->nc);
}

void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len)
{
	SlirpState *s = opaque;

	qemu_send_packet(&s->nc, pkt, pkt_len);
}

static ssize_t net_slirp_receive(VLANClientState *nc, const uint8_t *buf,
		size_t size)
{
	SlirpState *s = DO_UPCAST(SlirpState, nc, nc);

	printf("net_slirp_receive: %d\n", size);
	print_packet(buf, size, F_RED);

	slirp_input(s->slirp, buf, size);

	return size;
}

static void net_slirp_cleanup(VLANClientState *nc)
{
	SlirpState *s = DO_UPCAST(SlirpState, nc, nc);

	slirp_cleanup(s->slirp);
	slirp_smb_cleanup(s);
	QTAILQ_REMOVE(&slirp_stacks, s, entry);
}

static NetClientInfo net_slirp_info =
{ .type = NET_CLIENT_TYPE_SLIRP, .size = sizeof(SlirpState),
		.receive = net_slirp_receive, .cleanup = net_slirp_cleanup, };

// Initial SLIRP network.
//ret = net_slirp_init(vlan, "user", name, restricted, vnet, vhost,
//                        vhostname, tftp_export, bootfile, vdhcp_start,
//                        vnamesrv, smb_export, vsmbsrv);
static int net_slirp_init(VLANState *vlan, const char *model,
		const char *name,
		int restricted,
		const char *vnetwork, // Client network address (IP).
		const char *vhost, const char *vhostname, const char *tftp_export,
		const char *bootfile, const char *vdhcp_start, const char *vnameserver,
		const char *smb_export, const char *vsmbserver)
{
	/* default settings according to historic slirp */
	struct in_addr net =
	{ .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
	struct in_addr mask =
	{ .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
	struct in_addr host =
	{ .s_addr = htonl(0x0a000202) }; /* 10.0.2.2: host address that the client sees */
	struct in_addr dhcp =
	{ .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15: Host IP Address */
	struct in_addr dns =
	{ .s_addr = htonl(0x0a000203) }; /* 10.0.2.3: DNS server */
#ifndef _WIN32
	struct in_addr smbsrv =
	{ .s_addr = 0 };
#endif
	VLANClientState *nc;
	SlirpState *s;
	char buf[20];
	uint32_t addr;
	int shift;
	char *end;
	struct slirp_config_str *config;

	if (!tftp_export)
	{
		tftp_export = legacy_tftp_prefix;
	}
	if (!bootfile)
	{
		bootfile = legacy_bootp_filename;
	}

	if (vnetwork)
	{
		if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0)
		{
			// Get IP address from the parameter.
			if (!inet_aton(vnetwork, &net))
			{
				return -1;
			}
			addr = ntohl(net.s_addr);

			// Get netmask of the IP, for there is no mask in the parameter.
			if (!(addr & 0x80000000))
			{
				mask.s_addr = htonl(0xff000000); /* class A */
			}
			else if ((addr & 0xfff00000) == 0xac100000)
			{
				mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
			}
			else if ((addr & 0xc0000000) == 0x80000000)
			{
				mask.s_addr = htonl(0xffff0000); /* class B */
			}
			else if ((addr & 0xffff0000) == 0xc0a80000)
			{
				mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
			}
			else if ((addr & 0xffff0000) == 0xc6120000)
			{
				mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
			}
			else if ((addr & 0xe0000000) == 0xe0000000)
			{
				mask.s_addr = htonl(0xffffff00); /* class C */
			}
			else
			{
				mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
			}
		}
		// The parameter includes sub-net mask.
		else
		{
			if (!inet_aton(buf, &net))
			{
				return -1;
			}
			shift = strtol(vnetwork, &end, 10);
			if (*end != '\0')
			{
				if (!inet_aton(vnetwork, &mask))
				{
					return -1;
				}
			}
			// Net mask must not be larger than 28. E.g. 10.0.7.6/29 is illegal.
			else if (shift < 4 || shift > 32)
			{
				return -1;
			}
			else
			{
				mask.s_addr = htonl(0xffffffff << (32 - shift));
			}
		}

		// Get sub-net
		net.s_addr &= mask.s_addr;
		// Add tail to the net IP address. Default is *.*.2.2
		host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
		// Add tail to the DHCP address. Default is *.*.2.15
		dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
		// Add tail to the DNS server address. Default is *.*.2.3
		dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
	}

	if (vhost && !inet_aton(vhost, &host))
	{
		return -1;
	}

	if ((host.s_addr & mask.s_addr) != net.s_addr)
	{
		return -1;
	}

	// if dhcpstart is supplied by the '-user' parameter.
	if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp))
	{
		return -1;
	}

	// Error occurs when:
	// The IP to be addressed is not in the sun-net OR:
	// The IP to be addressed is the same with HOST IP OR:
	// The IP to be addressed is the same with DNS IP.
	if ((dhcp.s_addr & mask.s_addr) != net.s_addr || dhcp.s_addr == host.s_addr
			|| dhcp.s_addr == dns.s_addr)
	{
		return -1;
	}

	if (vnameserver && !inet_aton(vnameserver, &dns))
	{
		return -1;
	}

	// Error occurs when:
	// DNS address is not in the sub-net OR
	// DNS address is the same with HOST IP.
	if ((dns.s_addr & mask.s_addr) != net.s_addr || dns.s_addr == host.s_addr)
	{
		return -1;
	}

#ifndef _WIN32
	if (vsmbserver && !inet_aton(vsmbserver, &smbsrv))
	{
		return -1;
	}
#endif

	nc = qemu_new_net_client(&net_slirp_info, vlan, NULL, model, name);

	snprintf(nc->info_str, sizeof(nc->info_str), "net=%s, restricted=%c",
			inet_ntoa(net), restricted ? 'y' : 'n');

	s = DO_UPCAST(SlirpState, nc, nc);

	s->slirp = slirp_init(restricted,
			net, 	// Sub-net identifier
			mask, 	// Sub-net mask
			host, 	// Host IP address seen from the client, this is also the default gateway.
			vhostname, tftp_export,
			bootfile,
			dhcp, 	// Starting address that is to be addressed to the client
			dns, 	// DNS address that is to be addressed
			s);

	QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);

	for (config = slirp_configs; config; config = config->next)
	{
		if (config->flags & SLIRP_CFG_HOSTFWD)
		{
			if (slirp_hostfwd(s, config->str, config->flags & SLIRP_CFG_LEGACY)
					< 0)
				goto error;
		}
		else
		{
			if (slirp_guestfwd(s, config->str, config->flags & SLIRP_CFG_LEGACY)
					< 0)
				goto error;
		}
	}
#ifndef _WIN32
	if (!smb_export)
	{
		smb_export = legacy_smb_export;
	}
	if (smb_export)
	{
		if (slirp_smb(s, smb_export, smbsrv) < 0)
			goto error;
	}
#endif

	return 0;

	error: qemu_del_vlan_client(nc);
	return -1;
}

static SlirpState *slirp_lookup(Monitor *mon, const char *vlan,
		const char *stack)
{

	if (vlan)
	{
		VLANClientState *nc;
		nc = qemu_find_vlan_client_by_name(mon, strtol(vlan, NULL, 0), stack);
		if (!nc)
		{
			return NULL;
		}
		if (strcmp(nc->model, "user"))
		{
			monitor_printf(mon, "invalid device specified\n");
			return NULL;
		}
		return DO_UPCAST(SlirpState, nc, nc);
	}
	else
	{
		if (QTAILQ_EMPTY(&slirp_stacks))
		{
			monitor_printf(mon, "user mode network stack not in use\n");
			return NULL;
		}
		return QTAILQ_FIRST(&slirp_stacks);
	}
}

void net_slirp_hostfwd_remove(Monitor *mon, const QDict *qdict)
{
	struct in_addr host_addr =
	{ .s_addr = INADDR_ANY };
	int host_port;
	char buf[256] = "";
	const char *src_str, *p;
	SlirpState *s;
	int is_udp = 0;
	int err;
	const char *arg1 = qdict_get_str(qdict, "arg1");
	const char *arg2 = qdict_get_try_str(qdict, "arg2");
	const char *arg3 = qdict_get_try_str(qdict, "arg3");

	if (arg2)
	{
		s = slirp_lookup(mon, arg1, arg2);
		src_str = arg3;
	}
	else
	{
		s = slirp_lookup(mon, NULL, NULL);
		src_str = arg1;
	}
	if (!s)
	{
		return;
	}

	if (!src_str || !src_str[0])
		goto fail_syntax;

	p = src_str;
	get_str_sep(buf, sizeof(buf), &p, ':');

	if (!strcmp(buf, "tcp") || buf[0] == '\0')
	{
		is_udp = 0;
	}
	else if (!strcmp(buf, "udp"))
	{
		is_udp = 1;
	}
	else
	{
		goto fail_syntax;
	}

	if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
	{
		goto fail_syntax;
	}
	if (buf[0] != '\0' && !inet_aton(buf, &host_addr))
	{
		goto fail_syntax;
	}

	host_port = atoi(p);

	err = slirp_remove_hostfwd(QTAILQ_FIRST(&slirp_stacks)->slirp, is_udp,
			host_addr, host_port);

	monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
			err ? "removed" : "not found");
	return;

	fail_syntax: monitor_printf(mon, "invalid format\n");
}

static int slirp_hostfwd(SlirpState *s, const char *redir_str,
		int legacy_format)
{
	struct in_addr host_addr =
	{ .s_addr = INADDR_ANY };
	struct in_addr guest_addr =
	{ .s_addr = 0 };
	int host_port, guest_port;
	const char *p;
	char buf[256];
	int is_udp;
	char *end;

	p = redir_str;
	if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0)
	{
		goto fail_syntax;
	}
	if (!strcmp(buf, "tcp") || buf[0] == '\0')
	{
		is_udp = 0;
	}
	else if (!strcmp(buf, "udp"))
	{
		is_udp = 1;
	}
	else
	{
		goto fail_syntax;
	}

	if (!legacy_format)
	{
		if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
		{
			goto fail_syntax;
		}
		if (buf[0] != '\0' && !inet_aton(buf, &host_addr))
		{
			goto fail_syntax;
		}
	}

	if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0)
	{
		goto fail_syntax;
	}
	host_port = strtol(buf, &end, 0);
	if (*end != '\0' || host_port < 1 || host_port > 65535)
	{
		goto fail_syntax;
	}

	if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
	{
		goto fail_syntax;
	}
	if (buf[0] != '\0' && !inet_aton(buf, &guest_addr))
	{
		goto fail_syntax;
	}

	guest_port = strtol(p, &end, 0);
	if (*end != '\0' || guest_port < 1 || guest_port > 65535)
	{
		goto fail_syntax;
	}

	if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
			guest_port) < 0)
	{
		qemu_error("could not set up host forwarding rule '%s'\n", redir_str);
		return -1;
	}
	return 0;

	fail_syntax: qemu_error("invalid host forwarding rule '%s'\n", redir_str);
	return -1;
}

void net_slirp_hostfwd_add(Monitor *mon, const QDict *qdict)
{
	const char *redir_str;
	SlirpState *s;
	const char *arg1 = qdict_get_str(qdict, "arg1");
	const char *arg2 = qdict_get_try_str(qdict, "arg2");
	const char *arg3 = qdict_get_try_str(qdict, "arg3");

	if (arg2)
	{
		s = slirp_lookup(mon, arg1, arg2);
		redir_str = arg3;
	}
	else
	{
		s = slirp_lookup(mon, NULL, NULL);
		redir_str = arg1;
	}
	if (s)
	{
		slirp_hostfwd(s, redir_str, 0);
	}

}

int net_slirp_redir(const char *redir_str)
{
	struct slirp_config_str *config;

	if (QTAILQ_EMPTY(&slirp_stacks))
	{
		config = qemu_malloc(sizeof(*config));
		pstrcpy(config->str, sizeof(config->str), redir_str);
		config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY;
		config->next = slirp_configs;
		slirp_configs = config;
		return 0;
	}

	return slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1);
}

#ifndef _WIN32

/* automatic user mode samba server configuration */
static void slirp_smb_cleanup(SlirpState *s)
{
	char cmd[128];

	if (s->smb_dir[0] != '\0')
	{
		snprintf(cmd, sizeof(cmd), "rm -rf %s", s->smb_dir);
		system(cmd);
		s->smb_dir[0] = '\0';
	}
}

static int slirp_smb(SlirpState* s, const char *exported_dir,
		struct in_addr vserver_addr)
{
	static int instance;
	char smb_conf[128];
	char smb_cmdline[128];
	FILE *f;

	snprintf(s->smb_dir, sizeof(s->smb_dir), "/tmp/qemu-smb.%ld-%d",
			(long) getpid(), instance++);
	if (mkdir(s->smb_dir, 0700) < 0)
	{
		qemu_error("could not create samba server dir '%s'\n", s->smb_dir);
		return -1;
	}
	snprintf(smb_conf, sizeof(smb_conf), "%s/%s", s->smb_dir, "smb.conf");

	f = fopen(smb_conf, "w");
	if (!f)
	{
		slirp_smb_cleanup(s);
		qemu_error("could not create samba server configuration file '%s'\n",
				smb_conf);
		return -1;
	}
	fprintf(f, "[global]\n"
		"private dir=%s\n"
		"smb ports=0\n"
		"socket address=127.0.0.1\n"
		"pid directory=%s\n"
		"lock directory=%s\n"
		"log file=%s/log.smbd\n"
		"smb passwd file=%s/smbpasswd\n"
		"security = share\n"
		"[qemu]\n"
		"path=%s\n"
		"read only=no\n"
		"guest ok=yes\n", s->smb_dir, s->smb_dir, s->smb_dir, s->smb_dir,
			s->smb_dir, exported_dir);
	fclose(f);

	snprintf(smb_cmdline, sizeof(smb_cmdline), "%s -s %s", SMBD_COMMAND,
			smb_conf);

	if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0)
	{
		slirp_smb_cleanup(s);
		qemu_error("conflicting/invalid smbserver address\n");
		return -1;
	}
	return 0;
}

/* automatic user mode samba server configuration (legacy interface) */
int net_slirp_smb(const char *exported_dir)
{
	struct in_addr vserver_addr =
	{ .s_addr = 0 };

	if (legacy_smb_export)
	{
		fprintf(stderr, "-smb given twice\n");
		return -1;
	}
	legacy_smb_export = exported_dir;
	if (!QTAILQ_EMPTY(&slirp_stacks))
	{
		return slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir,
				vserver_addr);
	}
	return 0;
}

#endif /* !defined(_WIN32) */

struct GuestFwd
{
	CharDriverState *hd;
	struct in_addr server;
	int port;
	Slirp *slirp;
};

static int guestfwd_can_read(void *opaque)
{
	struct GuestFwd *fwd = opaque;
	return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
}

static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
{
	struct GuestFwd *fwd = opaque;
	slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
}

static int slirp_guestfwd(SlirpState *s, const char *config_str,
		int legacy_format)
{
	struct in_addr server =
	{ .s_addr = 0 };
	struct GuestFwd *fwd;
	const char *p;
	char buf[128];
	char *end;
	int port;

	p = config_str;
	if (legacy_format)
	{
		if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
		{
			goto fail_syntax;
		}
	}
	else
	{
		if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
		{
			goto fail_syntax;
		}
		if (strcmp(buf, "tcp") && buf[0] != '\0')
		{
			goto fail_syntax;
		}
		if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
		{
			goto fail_syntax;
		}
		if (buf[0] != '\0' && !inet_aton(buf, &server))
		{
			goto fail_syntax;
		}
		if (get_str_sep(buf, sizeof(buf), &p, '-') < 0)
		{
			goto fail_syntax;
		}
	}
	port = strtol(buf, &end, 10);
	if (*end != '\0' || port < 1 || port > 65535)
	{
		goto fail_syntax;
	}

	fwd = qemu_malloc(sizeof(struct GuestFwd));
	snprintf(buf, sizeof(buf), "guestfwd.tcp:%d", port);
	fwd->hd = qemu_chr_open(buf, p, NULL);
	if (!fwd->hd)
	{
		qemu_error("could not open guest forwarding device '%s'\n", buf);
		qemu_free(fwd);
		return -1;
	}

	if (slirp_add_exec(s->slirp, 3, fwd->hd, &server, port) < 0)
	{
		qemu_error("conflicting/invalid host:port in guest forwarding "
			"rule '%s'\n", config_str);
		qemu_free(fwd);
		return -1;
	}
	fwd->server = server;
	fwd->port = port;
	fwd->slirp = s->slirp;

	qemu_chr_add_handlers(fwd->hd, guestfwd_can_read, guestfwd_read, NULL, fwd);
	return 0;

	fail_syntax: qemu_error("invalid guest forwarding rule '%s'\n", config_str);
	return -1;
}

void do_info_usernet(Monitor *mon)
{
	SlirpState *s;

	QTAILQ_FOREACH(s, &slirp_stacks, entry)
	{
		monitor_printf(mon, "VLAN %d (%s):\n",
				s->nc.vlan ? s->nc.vlan->id : -1, s->nc.name);
		slirp_connection_info(s->slirp, mon);
	}
}

static int net_init_slirp_configs(const char *name, const char *value,
		void *opaque)
{
	struct slirp_config_str *config;

	if (strcmp(name, "hostfwd") != 0 && strcmp(name, "guestfwd") != 0)
	{
		return 0;
	}

	config = qemu_mallocz(sizeof(*config));

	pstrcpy(config->str, sizeof(config->str), value);

	if (!strcmp(name, "hostfwd"))
	{
		config->flags = SLIRP_CFG_HOSTFWD;
	}

	config->next = slirp_configs;
	slirp_configs = config;

	return 0;
}

int net_init_slirp(QemuOpts *opts, Monitor *mon, const char *name,
		VLANState *vlan)
{
	struct slirp_config_str *config;
	const char *vhost;
	const char *vhostname;
	const char *vdhcp_start;
	const char *vnamesrv;
	const char *tftp_export;
	const char *bootfile;
	const char *smb_export;
	const char *vsmbsrv;
	char *vnet = NULL;
	int restricted = 0;
	int ret;

	// -user parameter.
	vhost = qemu_opt_get(opts, "host");
	vhostname = qemu_opt_get(opts, "hostname");
	vdhcp_start = qemu_opt_get(opts, "dhcpstart");
	vnamesrv = qemu_opt_get(opts, "dns");
	tftp_export = qemu_opt_get(opts, "tftp");
	bootfile = qemu_opt_get(opts, "bootfile");
	smb_export = qemu_opt_get(opts, "smb");
	vsmbsrv = qemu_opt_get(opts, "smbserver");

	if (qemu_opt_get(opts, "ip"))
	{
		const char *ip = qemu_opt_get(opts, "ip");
		int l = strlen(ip) + strlen("/24") + 1;

		vnet = qemu_malloc(l);

		/* emulate legacy ip= parameter */
		pstrcpy(vnet, l, ip);
		pstrcat(vnet, l, "/24");
	}

	if (qemu_opt_get(opts, "net"))
	{
		if (vnet)
		{
			qemu_free(vnet);
		}
		vnet = qemu_strdup(qemu_opt_get(opts, "net"));
	}

	if (qemu_opt_get(opts, "restrict") && qemu_opt_get(opts, "restrict")[0]
			== 'y')
	{
		restricted = 1;
	}

	// Host forward & Guest forward.
	qemu_opt_foreach(opts, net_init_slirp_configs, NULL, 0);

	// vnet refers to the subnet, not the vlan ID.
	ret = net_slirp_init(vlan, "user", name, restricted, vnet, vhost,
			vhostname, tftp_export, bootfile, vdhcp_start, vnamesrv,
			smb_export, vsmbsrv);

	while (slirp_configs)
	{
		config = slirp_configs;
		slirp_configs = config->next;
		qemu_free(config);
	}

	qemu_free(vnet);

	return ret;
}

int net_slirp_parse_legacy(QemuOptsList *opts_list, const char *optarg,
		int *ret)
{
	if (strcmp(opts_list->name, "net") != 0 || strncmp(optarg, "channel,",
			strlen("channel,")) != 0)
	{
		return 0;
	}

	/* handle legacy -net channel,port:chr */
	optarg += strlen("channel,");

	if (QTAILQ_EMPTY(&slirp_stacks))
	{
		struct slirp_config_str *config;

		config = qemu_malloc(sizeof(*config));
		pstrcpy(config->str, sizeof(config->str), optarg);
		config->flags = SLIRP_CFG_LEGACY;
		config->next = slirp_configs;
		slirp_configs = config;
		*ret = 0;
	}
	else
	{
		*ret = slirp_guestfwd(QTAILQ_FIRST(&slirp_stacks), optarg, 1);
	}

	return 1;
}

